Drill-steel retainer



e. GLTU'TTLE. pmu. STEEL RETAINER. APPLICATION FILED JUNE 2 1921.

Emmed ept. 19, 3922,.

INVENTOR Patented Sept. 19, 1922.

rear

GROVER G. TUTTLE, 0F PHILLIPSBURG, NEW JERSEY, ASSIGNOR TO INGERSOLL-RAND COMPANY, OF JERSEY CITY, NEW JERSEY, A CORPORATION OF NEW JERSEY.

DRILL-STEEL RETAINER.

To all whom it may concern:

Be it known that I, Gnovnn G. TUTTLE, a citizen of the United States, a resident of Phillipsburg, county of W arren, and State of New Jersey, have invented a certain Drill-Steel Retainer, of which the following is a specification, accompanied by drawings.

This invention relates to drill steel reta1ners for rock drills,'but more particularly to that type of retainer in which theyoke embraces the drill steel and is sultably held or clamped in position upon the front head of the machine.

Such yoke retainers are sub ected to severe impact as the collar on the drill steel strikes the yoke and various devices have been employed to cushion or yieldingly hold the voke to avoid breakage of the parts, some of these devices include bolts and springs, but the breakage is difficult to overcome, and

' "the more complex the parts, the greater the danger of breakage becomes.

The primary objects of the present invention are to simplify the retainer construction, and reduce the chances of breakage by avoiding the use of retainer bolts and supporting the yoke retainer from the i'ront head of the machine by means of main and supplementary springs which cushion the yoke in both directions.

Another object of the lnvention is to supplement the expansive force of the mam springs in holding the retainer, by means of fluid under pressure, which may be the l1ve pressure taken from the supply inlet of the machine. In'such case, if the pressure fails for any reason, the main retainer springs still fulfill the function of exerting pressure to cushion the yoke.

Another object of the invention is to make the casings for the springs separate from the front head and mount them to swing relatively to the front head, carrying the yoke retainer with them. This avoids the necessity of pivoting the yoke retainer to the spring casings and permits a simple connection between the retainer and the spring casings.

To these ends the invention is shown in its preferred forms in the accompanying drawings, in which Figure l is a diagrammatic front elevation of the front head of a rock drill having my drill steel retainer applied thereto, parts of the front head and retainer being shown in vertical section.

Figure 2 is a side elevation and Figure 3 is a horizontal section plan view of F igure 1 on the line 3--8.

Referr1ng to the drawings, A represents diagrammatically the front head of a rock drill having the nose piece B, adapted to receive the usual front head bushing C through which the drill steel D having the collar E, is adapted to extend in position to receive the impact blows of the hammer. The front head is provided with the usual lugs F through which the side bolts G eX- tend for clamping the cylinder and front head together. In this instance the front end portion H of the cylinder casing is shown diagrammatically and partly broken away to indicate the relation of the parts.

In accordance with my invention the front head is provided with cushion holding guides J pivoted at opposite sides of the machine and main cushioning means in the form of coiled springs K are guided and held within said guides J. Inorder to suitably pivot the guides J so that they may swing at each side of the front head, the said front head is conveniently provided with trunnions L and the guides J are mounted on blocks 0 having socket portions P for the trunnions L. The guides J are adapted to slide longitudinally on said blocks 0 so that they have a combined swinging and longitudinal movement relative to the fronthead of the machine. In order to permit longitudinal movement of the guides, the sides are cut away or slotted at Q over the blocks 0 and trunnions L.

A yoke retainer R is provided with arms or shanks S having stops or collars l, and these yoke arms extend longitudinally through the pivotal blocks 0 and through the ends U of the guides J. Nuts V on the ends of the yoke arms hold the parts in position. Leather washers or other packing device W over the yoke arms 5 aid in sealing the chambers X formed within the guides, and sleeves Y within the guides close the openings in the walls of the guides formed by the slots or cut away portions Q.

' The main springs K are adapted to be compressed between the blocks 0 and the end portions U of the guides. Supplemental of the device,

Passageways Z) in the main cyhndercasing I H and front head A communicate throughthe ports c'with the sealed interior ofthe guides supplying fluid pressure preferably llve'air, for assistln the GXPtLIlSlVB force of the main spring In accordance wlth my'construction and spring guides J have a combined pivotal and longitudinal movement bodily relative to theiront head. In order to maintain the yoke inoperative longitudinal position, the end faces d of the blocks 0 are preferably transversely grooved as indicated by the dotted lines 6 so'that' the yoke arms S may be sprung into and out of the o-rooves 6.

I cla m:

1. A drill steel retainer for rock drills, comprising swinging and longitudinal movable cushion holding g'uidesat each side of the front head of the machine cushioning means on said guides, a yoke retainer for the dr 11 steel having arms guided in said guides and cushioned by said cushioning means and means for maintaining fluid pressure within said guides to supplement the expansive force of the cushioning means in one direction.

2. A drill steel reta ner for rock drills,

comprising swinging and longitudinally movable spring holding guides pivoted at opposite sides of the front head of the machine, coiled springs within said guides, a yoke retainer forthe drill steel having arms guided in said guides and cushioned by said springs, and means for maintaining fluid pressure w1th1n said guides to supplement the expansive force of the cushioning means in one direction.

A drill steel retainer for rock drills comprising swinging and longitudinally movable spring holding guides pivoted at oppositesides of the front head of the machine, coiled springs within said guides, a yoke retainer for the drill steel having arms slidable longitudinally in said'guides and cushioned in both directions bv said springs, and means for maintaining fluid pressure within said guides to supplement the expansive force of the cushioning means in one direction. Y I

4. A drill steel retainer for rock drills, comprising swinging and longitudinally movable spring holding guides pivoted at opposite sides of the front head of the machine, main and supplementary springs coiled within said guides, a yoke retainer for the drill steel having arms slidable in said guides and cushioned in both directions by said main and supplementary springs respectively, and means for maintaining fluid pressure within said guides to supplement the expansive force of the cushioning means in one direction.

In testimony whereof I have signed this specification.

enovun e. TUTTLE. 

